bisecting fixing commit since 442489c219235991de86d0277b5d859ede6d8792 building syzkaller on b712935571355df44e126c5b27c98ccd53d1d18b testing commit 442489c219235991de86d0277b5d859ede6d8792 with gcc (GCC) 8.4.1 20210217 kernel signature: 88ac2acfccec89cef3e9015d80763712d37f136d4c477aab1ff1b3bb0034f724 run #0: crashed: WARNING in cgroup_apply_control_disable run #1: crashed: WARNING in cgroup_apply_control_disable run #2: crashed: WARNING in cgroup_apply_control_disable run #3: crashed: WARNING in cgroup_apply_control_disable run #4: crashed: WARNING in cgroup_apply_control_disable run #5: crashed: WARNING in cgroup_apply_control_disable run #6: crashed: WARNING in cgroup_apply_control_disable run #7: crashed: WARNING in cgroup_apply_control_disable run #8: crashed: WARNING in cgroup_apply_control_disable run #9: crashed: WARNING in cgroup_apply_control_disable run #10: crashed: WARNING in cgroup_apply_control_disable run #11: crashed: WARNING in cgroup_apply_control_disable run #12: crashed: WARNING in cgroup_apply_control_disable run #13: crashed: WARNING in cgroup_apply_control_disable run #14: crashed: WARNING in cgroup_apply_control_disable run #15: crashed: WARNING in cgroup_apply_control_disable run #16: crashed: WARNING in cgroup_apply_control_disable run #17: crashed: WARNING in cgroup_apply_control_disable run #18: crashed: WARNING in cgroup_apply_control_disable run #19: OK testing current HEAD d434405aaab7d0ebc516b68a8fc4100922d7f5ef testing commit d434405aaab7d0ebc516b68a8fc4100922d7f5ef with gcc (GCC) 10.2.1 20210217 kernel signature: 58fa2f554f9396fdec52d90975dd3c7aeddc4d4893883078a21c84cba8569182 all runs: crashed: WARNING in cgroup_apply_control_disable revisions tested: 2, total time: 25m27.27178072s (build: 12m45.461177713s, test: 11m45.183675976s) the crash still happens on HEAD commit msg: Linux 5.12-rc7 crash: WARNING in cgroup_apply_control_disable ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7421 at kernel/cgroup/cgroup.c:3100 cgroup_ss_mask kernel/cgroup/cgroup.c:442 [inline] WARNING: CPU: 0 PID: 7421 at kernel/cgroup/cgroup.c:3100 cgroup_apply_control_disable+0x348/0x450 kernel/cgroup/cgroup.c:3103 Modules linked in: CPU: 0 PID: 7421 Comm: syz-executor.3 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cgroup_apply_control_disable+0x348/0x450 kernel/cgroup/cgroup.c:3100 Code: 00 00 48 8d 78 08 48 89 fe 48 c1 ee 03 42 0f b6 34 3e 40 84 f6 74 0a 40 80 fe 03 0f 8e da 00 00 00 0f b7 40 08 e9 fe fe ff ff <0f> 0b e9 59 fe ff ff 48 83 c4 30 5b 5d 41 5c 41 5d 41 5e 41 5f c3 RSP: 0018:ffffc90000a77ae0 EFLAGS: 00010202 RAX: 1ffff110223fd902 RBX: ffffffff8953f9c0 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff87cb2d00 RDI: ffff888111fec810 RBP: ffff8881254da000 R08: 0000000000000001 R09: ffffffff8bfb6ba7 R10: fffffbfff17f6d74 R11: 0000000000000903 R12: ffffffff894eb340 R13: ffff888111fec800 R14: ffff8881254da000 R15: dffffc0000000000 FS: 0000000000b4e400(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004bd000 CR3: 000000010a2bf002 CR4: 00000000001706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cgroup_finalize_control kernel/cgroup/cgroup.c:3167 [inline] rebind_subsystems+0x3af/0xa90 kernel/cgroup/cgroup.c:1740 cgroup_setup_root+0x2ce/0x7b0 kernel/cgroup/cgroup.c:1974 cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1195 [inline] cgroup1_get_tree+0x7a1/0xbc0 kernel/cgroup/cgroup-v1.c:1212 vfs_get_tree+0x7f/0x2c0 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x7f3/0x1a10 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount fs/namespace.c:3431 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465c7a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 88 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe6a808438 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffe6a808478 RCX: 0000000000465c7a RDX: 00000000004b753b RSI: 00000000004ad236 RDI: 00000000004ad1f9 RBP: 00007ffe6a808470 R08: 00000000004bc388 R09: 00007ffe6a807eb0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe6a808470 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000400520 irq event stamp: 5853 hardirqs last enabled at (5923): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (5923): [] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 hardirqs last disabled at (5950): [] console_unlock+0x667/0xa00 kernel/printk/printk.c:2520 softirqs last enabled at (6124): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last enabled at (6124): [] __irq_exit_rcu kernel/softirq.c:422 [inline] softirqs last enabled at (6124): [] irq_exit_rcu+0x237/0x280 kernel/softirq.c:434 softirqs last disabled at (6139): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last disabled at (6139): [] __irq_exit_rcu kernel/softirq.c:422 [inline] softirqs last disabled at (6139): [] irq_exit_rcu+0x237/0x280 kernel/softirq.c:434 ---[ end trace 78b2befd4870faf7 ]---